[Feature][Transform-V2] Implement StructEvolution transform for structural changes

[corgy-w]

…ctural changes

Purpose of this pull request

For details, please refer to doc

Does this PR introduce any user-facing change?

How was this patch tested?

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config
• Update the release-note.

[Copilot]

Pull Request Overview

This pull request implements the StructEvolution transform for handling structural changes in table schemas as part of Transform‑V2.

• Adds unit tests for validating the transform behavior.
• Introduces a new transform factory and multi‑catalog transform class to support schema evolution.
• Updates API classes and documentation to incorporate new constructors and methods needed for schema evolution operations.

Reviewed Changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
seatunnel-transforms-v2/src/test/java/org/apache/seatunnel/transform/structevolution/StructEvolutionTransformTest.java	Adds unit tests for the StructEvolution transform.
seatunnel-transforms-v2/src/main/java/org/apache/seatunnel/transform/structevolution/StructEvolutionTransformFactory.java	Implements the factory to produce StructEvolution transform instances.
seatunnel-transforms-v2/src/main/java/org/apache/seatunnel/transform/structevolution/StructEvolutionMultiCatalogTransform.java	Provides multi-catalog support by delegating to the StructEvolution transform.
seatunnel-transforms-v2/src/main/java/org/apache/seatunnel/transform/structevolution/StructEvolutionConfig.java	Introduces configuration classes and JSON aliases for schema evolution options.
Other files	Updates to common transform classes and API classes for improved handling of comments, primary keys, and constraint keys; documentation updated accordingly.

Files not reviewed (1)

• plugin-mapping.properties: Language not supported

Comments suppressed due to low confidence (1)

seatunnel-transforms-v2/src/test/java/org/apache/seatunnel/transform/structevolution/StructEvolutionTransformTest.java:204

• [nitpick] Consider renaming the variable 'StructEvolutionTransform' to follow Java lower camel-case naming conventions (e.g., 'transform') to avoid confusion with the class name.

StructEvolutionTransform StructEvolutionTransform = new StructEvolutionTransform(config, catalogTable);